How do shy men act at work when they secretly like you?

I have this colleague who acts a bit odd around me. It’s very subtle but I noticed when he talks to me he tends to talk about anything and sort of quietly ramble, trail off and then start another convo on something random. Whilst with other people he is rather loud and assertive. I also noticed he drops back in a group setting at times so we walk together or seens to always end up sitting next to me. But then besides that there isn’t much. I was wondering how liking behaviour shows up in different people, esp. shy ones.

How do shy men act at work when they secretly like you?
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